Use app-relative path to index.html.
Use app-relative path to index.html.

Fixes fallback file for both IIS and self-host.

jochenvangasse/Klondike,davidvmckay/Klondike,fhchina/Klondike,Stift/Klondike,themotleyfool/Klondike,jochenvangasse/Klondike,davidvmckay/Klondike,davidvmckay/Klondike,themotleyfool/Klondike,Stift/Klondike,fhchina/Klondike,Stift/Klondike,themotleyfool/Klondike,fhchina/Klondike,jochenvangasse/Klondike